Kick It Out are investigating racial abuse directed at Sikh referee Sukhbir Singh after he took charge of Chelsea's pre-season defeat against Inter last weekend.

Sky Sports have reported that the official was the victim of the vitriol of fans angry with his performance in the friendly.

Singh awarded a contentious penalty against Chelsea in the first half after a challenge by Cesar Azpilicueta on Inter forward Stefan Jovetic, and Michy Batshuayi saw a late goal wrongly ruled out for offside in the 2-1 defeat.